So I am working on a Demonic Invasion/Zombie Apocalypse game of Mutants and Masterminds which is still in the early brainstorming phase. I'm still learning the system and had some ideas for villains that I wasn't sure how to make.

Zombies aren't exactly much of a threat to super heroes, even PL 8 ones which is what my game is going to be, so most of the zombies will be incredibly augmented. One monster is actually a 30 ft tall swarm of zombies, stacked on top of each other, moving in unison. I don't see a power for a swarm body. For that matter, a man who can change into a swarm of cockroaches would be hard to do as well.